Which of the following is the best definition for primary source? a. a piece of evidence that does not have any prejudice or bias b. a piece of evidence that has been reviewed by an expert c. a piece of evidence created at the time of a historical event d. a piece of evidence created long after a historical event

the lowest among the social higher rank were the working class. this class remained detached to the political progression   of the country and was hostile to the other two classes

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b